Rope grab recommendations for rigging

[Flying~Squirrel]

I'd like to hear recommendations for the best rope grab device to use as a way to attach a set of 4s to a rigging line for pretentioning and lifting, then quickly be removed to lower from a friction device. It would also get used as a way to extend a winch line for repeated advancement pulls.

The traits I'm hoping for are:
- quick on and off
- smooth easy progress
- ability to release friction
- maximized breaking strength of the rope being grabbed
+ Maybe having an integrated pulley, for easy advancement of the slacked system. This is less necessary, and may not be worth the complexity.

I've mostly been using a prussic, but it's not that quick on and off and can be a real bastard to quickly reset for another length of pull. It does check the other boxes, and it's cheap and easy to tweak your set up.

I've used a handled ascender, but being unable to smoothly ease tension can lead to trouble.

I've thought about using a lanyard style rope grab, but I have little experience with these and don't think they are easy on / off. Maybe I am wrong.

 

[Matias]

other than the quick on/off factor, a Zillon does all of that really well

 

[Flying~Squirrel]

other than the quick on/off factor, a Zillon does all of that really well

Quick on off is very important. I have considered using mechanical climbing devices, but it's expensive to experiment with!

 

[Matias]

If quick on/off is critical, AND you want max strength retention, AND releasable under load, then you'll be hard pressed to beat a prusik

 

[Brocky]

Maybe something like this: